refactor: isolate SSE setup

api/prisma/migrations/20250609203423_notify_sse/migration.sql

@@ -0,0 +1,26 @@
+-- Create function and trigger to notify SSE on planilla changes
+CREATE OR REPLACE FUNCTION notify_planilla_change() RETURNS trigger AS $$
+DECLARE
+  payload TEXT;
+BEGIN
+  payload := json_build_object(
+    'table', TG_TABLE_NAME,
+    'operation', TG_OP,
+    'old', row_to_json(OLD),
+    'new', row_to_json(NEW)
+  )::text;
+  PERFORM pg_notify('sse_events', payload);
+  IF TG_OP = 'DELETE' THEN
+    RETURN OLD;
+  ELSE
+    RETURN NEW;
+  END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS planilla_notify_trigger ON "Planilla";
+CREATE TRIGGER planilla_notify_trigger
+  AFTER INSERT OR UPDATE OR DELETE ON "Planilla"
+  DEFERRABLE INITIALLY DEFERRED
+  FOR EACH ROW
+  EXECUTE PROCEDURE notify_planilla_change();